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Full Discussion: Variable not found error in while loop
Top Forums Shell Programming and Scripting Variable not found error in while loop Post 302939645 by Corona688 on Friday 27th of March 2015 10:46:38 AM
Old 03-27-2015
Actually, if your loop is doing what I think it is -- running one head, tail, awk and tr for each line in a file -- that is extremely inefficient, and should be replaced entirely with a while read loop which just reads lines directly instead of scrubbing the entire file through 3 external utilities each loop to do so.

read also has the useful feature of splitting on tokens. It can split on | for you without calling any external programs either. It works best with a predictable number of fields, since if there's more fields than variables, the last n extra fields get lumped in the last one you list.

Code:
while IFS="|" read -r VARA VARB VARC VARD VARE
do
        echo "D is $VARD"
done < inputfile

This User Gave Thanks to Corona688 For This Post:
TomG
 

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LEARN ABOUT DEBIAN

smd-loop

smd-loop(1)						 Sync Mail Dir (smd) documentation					       smd-loop(1)

NAME

       smd-loop - iterates smd-pull and smd-push

SYNOPSIS

       smd-loop [-vt]

DESCRIPTION

       smd-loop  runs  smd-push and smd-pull at regular intervals as defined by the user in the ~/.smd/loop configuration file. On errors that are
       reported to be transient, it retries a second time before failing.

       The configuration file is line-oriented. Each line is composed of three space separated fields:	pull-frequency,  push-frequency  and  end-
       point-name. Frequencies are expressed in minutes, while endpoint name is a valid name for smd-pull(1) and smd-push(1). Lines beginning with
       # are considered as comments. The following example calls the command smd-pull default every 3 minutes,	and  smd-push  default	every  10.
       Example:

	   # pull-frequency push-frequency endpoint-name
	     3		    10		   default

OPTIONS

       -v     Increase program verbosity (printed on stderr)

       -t     Just create a template configuration file if none

FILES

       ~/.smd/loop

SEE ALSO

       mddiff(1), smd-server(1), smd-client(1), smd-push(1), smd-pull(1)

AUTHOR

       Enrico Tassi <gares@fettunta.org>

								   11 June 2012 						       smd-loop(1)
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